Python 2.7 reduce lambda statement conversion to list comprehension

I was examining a code written in python but I got confused with the following line.

return ( reduce(lambda x, y: x + y[0],myList, 0)/len(Actions), )

This code takes x and y as an input sums x and y's first element. After that I think it reduces myList to the value of x+y[0] . How can I accomplish this with using list comprehension instead of using lambda.